This resources helped me.

Below, you can find the link for several available resources specifically for both GRE's. 

Honestly, I think these are all you need:
1. https://www.mathsub.com/resources/

2. For an idea of how to study and what to expect: https://mathematicsgre.com/viewtopic.php?t=4577

3. For Calculus I-II: https://ocw.mit.edu/courses/mathematics/18-01-single-variable-calculus-fall-2006/

4. For Calculus III: https://ocw.mit.edu/courses/mathematics/18-02-multivariable-calculus-fall-2007/exams/

5. For Linear Algebra: https://ocw.mit.edu/courses/mathematics/18-06-linear-algebra-spring-2010/

6. For everything else (,i.e., Algebra, Topology, Real and Complex Analysis, Discrete Math, Statistics and Probability): Cracking the Subject GRE Princeton Review